<template>
  <div class="drag" ref="dragDiv">
    <div class="drag_bg"></div>
    <div class="flex">
      <!-- <div v-if="lang === 'zh'" class="drag_text zh">{{ confirmWords }}</div> -->
      <div  class="drag_text en flex jc-c">
          <span v-if="!confirmSuccess" class="fix"></span>
          <span class="fg1">{{ confirmWords }}</span>
           <span v-if="confirmSuccess" class="fix"></span>
      </div>
      <div
        ref="moveDiv"
        @mousedown="mouseDownFn($event)"
        :class="{ handler_ok_bg: confirmSuccess }"
        class="handler handler_bg"
        style="position: absolute; top: 0px; left: 0px"
      ></div>
    </div>
  </div>
</template>

<script>
// let isDev = process.env.NODE_ENV === "development";
export default {
  data() {
    return {
      beginClientX: 0 /*距离屏幕左端距离*/,
      mouseMoveState: false /*触发拖动状态  判断*/,
      maxWidth: 0 /*拖动最大宽度，依据滑块宽度算出来的*/,
      confirmWords: this.$t("lang.sliderText") /*滑块文字*/,
      confirmSuccess: false /*验证成功判断*/,
    };
  },
  mounted() {
    this.maxWidth =
      this.$refs.dragDiv.clientWidth - this.$refs.moveDiv.clientWidth;
    document
      .getElementsByTagName("html")[0]
      .addEventListener("mousemove", this.mouseMoveFn);
    document
      .getElementsByTagName("html")[0]
      .addEventListener("mouseup", this.moseUpFn);
      // 开发,省略滑动验证
      //  this.successFunction();
  },
  computed: {
    lang() {
      return this.$store.state.lang;
    },
  },

  methods: {
    //mousedown 事件
    mouseDownFn: function (e) {
      if (!this.confirmSuccess) {
        e.preventDefault && e.preventDefault(); //阻止文字选中等 浏览器默认事件
        this.mouseMoveState = true;
        this.beginClientX = e.clientX;
      }
    },
    //验证成功函数
    successFunction() {
      this.confirmSuccess = true;
      this.confirmWords =
        this.$i18n.locale === "zh" ? "验证通过" : "Verification passed";
      if (window.addEventListener) {
        document
          .getElementsByTagName("html")[0]
          .removeEventListener("mousemove", this.mouseMoveFn);
        document
          .getElementsByTagName("html")[0]
          .removeEventListener("mouseup", this.moseUpFn);
      } else {
        document
          .getElementsByTagName("html")[0]
          .removeEventListener("mouseup", () => {});
      }
      document.getElementsByClassName("drag_text")[0].style.color = "#fff";
      document.getElementsByClassName("handler")[0].style.left =
        this.maxWidth + "px";
      document.getElementsByClassName("drag_bg")[0].style.width =
        this.maxWidth + "px";
    },
    //mousemove事件
    mouseMoveFn(e) {
      if (this.mouseMoveState) {
        let width = e.clientX - this.beginClientX;
        if (width > 0 && width <= this.maxWidth) {
          document.getElementsByClassName("handler")[0].style.left =
            width + "px";
          document.getElementsByClassName("drag_bg")[0].style.width =
            width + "px";
        } else if (width > this.maxWidth) {
          this.successFunction();
        }
      }
    },
    //mouseup事件
    moseUpFn(e) {
      this.mouseMoveState = false;
      var width = e.clientX - this.beginClientX;
      if (width < this.maxWidth) {
        document.getElementsByClassName("handler")[0].style.left = 0 + "px";
        document.getElementsByClassName("drag_bg")[0].style.width = 0 + "px";
      }
    },
  },

};
</script>
<style lang="less" scoped>
.drag {
  position: relative;
  background-color: #e8e8e8;
  width: 100%;
  height: 40px;
  line-height: 40px;
  text-align: center;
  border: 1px solid #ccc;
  border-radius: 4px;
}
.handler {
  width: 40px;
  height: 38px;
  border: 1px solid #ccc;
  border-radius: 4px;
  cursor: move;
}
.handler_bg {
  background: #fff
    url("")
    no-repeat center;
}
.handler_ok_bg {
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
  background: #fff
    url("")
    no-repeat center;
}
.drag_bg {
  background-color: #7ac23c;
  height: 38px;
  width: 0px;
  border-radius: 4px 0 0 4px;
}
.drag_text {
  position: absolute;
  top: 0px;
  font-size: 14px;
  width: 100%;
  text-align: center;
  -moz-user-select: none;
  -webkit-user-select: none;
  user-select: none;
  -o-user-select: none;
  -ms-user-select: none;
  .fix{
      width: 40px;
  }
}
</style>